Centralized water supply device and method

Abstract

The invention provides a centralized water supply device and method, and solves the problem of realizing stable, safe and efficient centralized water supply wirelessly under the conditions of large water quality difference and poor maintenance conditions. A centralized water supply device comprises a water inlet, a primary filter tank, a ceramic ultrafiltration membrane, a pressure type activated carbon filter tank, a ceramic nanofiltration membrane, a disinfection water production tank, a water outlet and a cleaning water tank which are sequentially connected, filtration of raw water of different water qualities is achieved, produced water can meet the national standard, meanwhile, no agent is consumed in the water supply process of the water supply device, and the water supply device is environmentally friendly. And the safety of water supply is ensured.

Description

Technical Field

[0001] The present invention relates to the field of water supply treatment, and in particular to a centralized water supply device and method. Background Art

[0002] At present, in some mountainous areas and remote rural areas, water cannot be supplied through unified water supply pipelines for work or life. The current solution is mostly to dig wells to use groundwater or use mountain spring water, and then purify the water before use.

[0003] my country's rural areas are vast, scattered, and the water resources vary greatly. Rural water supply has always been a problem. Before 2020, rural water supply was mainly decentralized, and decentralized water supply was mainly provided by single or joint households through hand-operated wells, springs, rainwater and other facilities, which could not guarantee the water quality and quantity of rural residents. Centralized water supply refers to the centralized treatment of water from water sources and its transportation to each household through a pipeline network, which effectively guarantees the quality and quantity of drinking water. In areas with relatively good economic conditions, the rural water supply model has gradually transitioned to centralized water supply. However, due to the limited conditions in rural areas and the large differences in water sources faced by centralized water supply, how to ensure the stable and efficient operation of centralized water supply under low maintenance conditions and water quality changes, while the water production can meet national standards, has become a problem that needs to be solved for centralized water supply.

[0004] Ceramic membrane is a separation membrane made of inorganic non-metallic materials, usually made of alumina (Al2O3), zirconium oxide (ZrO2), silicon carbide (SiC) and other raw materials through high-temperature sintering process. It has the characteristics of high mechanical strength, good chemical stability, excellent heat resistance, and resistance to microbial erosion, and is widely used in various industrial fields. It has the following characteristics: (1) High heat resistance and stable chemical properties: Ceramic membranes can work stably in a wide temperature range (from low temperature to several hundred degrees Celsius), and have good resistance to acids, alkalis and organic solvents, and are suitable for separation processes under various harsh environments; (2) Good mechanical properties: Due to its hard structure, ceramic membranes are not easy to deform or damage, can withstand high operating pressures, and are suitable for filtration applications under high pressure conditions; (3) Long life: Compared with organic polymer membranes, ceramic membranes are not easy to age, have a longer service life, reduce replacement frequency, and reduce long-term operating costs; (4) Easy to clean and regenerate: The surface of ceramic membranes is smooth, pollutants are not easy to adhere, and are easy to clean; at the same time, their flux characteristics can be effectively restored by physical or chemical methods. Its excellent performance is suitable for various requirements of rural water supply. Summary of the invention

[0005] The present invention provides a centralized water supply device and method to solve the above problems.

[0006] In a first aspect, the present invention provides a centralized water supply device, comprising: a water inlet, a primary filter tank, a ceramic ultrafiltration membrane, a pressure activated carbon filter tank, a ceramic nanofiltration membrane, a disinfection water production tank and a water outlet, and a cleaning water tank connected to the disinfection water production tank; wherein,

[0007] The primary filter tank is provided with a coarse grid and quartz sand filler;

[0008] The disinfection water production tank is provided with a heating device for heating water to the disinfection temperature;

[0009] The cleaning water tank is provided with a heat preservation structure for maintaining the water temperature in the tank within a preset range; the heated water in the disinfection water production tank enters the cleaning water tank through overflow;

[0010] The cleaning water tank is also connected to one or more (in this application, the "multiple" means at least two) of the primary filter tank, the ceramic ultrafiltration membrane, the pressure activated carbon filter tank, and the ceramic nanofiltration membrane through a pipeline, and the hot water in the cleaning water tank is used to clean the filter components regularly or as needed;

[0011] The primary filter tank, the ceramic ultrafiltration membrane, the pressure activated carbon filter tank and the ceramic nanofiltration membrane are each connected to the wastewater outlet through an independent valve. In a preferred embodiment, a first pump is provided on the pipeline between the primary filter tank and the ceramic ultrafiltration membrane, and a second pump is provided on the pipeline between the pressure activated carbon filter tank and the ceramic nanofiltration membrane.

[0012] In a preferred embodiment, a third pump is further provided on the upstream pipeline connecting the cleaning water tank to one or more of the primary filtration tank, the ceramic ultrafiltration membrane, the pressure activated carbon filter tank, and the ceramic nanofiltration membrane.

[0013] In a preferred embodiment, the bar gap of the coarse grid is 10-15 mm, and the diameter specification of the quartz sand filler is 16-32 mm.

[0014] In a preferred embodiment, the pore size of the ceramic ultrafiltration membrane is 0.1-1 μm, the operating pressure is <0.1 MPa, and the recovery rate is above 80%.

[0015] In a preferred embodiment, the pressure activated carbon filter tank is filled with 8-10 mesh coconut shell activated carbon, and the pressure tank can withstand a maximum pressure of 2MPa.

[0016] In a preferred embodiment, the molecular weight cut-off of the ceramic nanofiltration membrane is 500 Dalton, the operating pressure is <0.4 MPa, and the recovery rate is above 50%.

[0017] In a preferred embodiment, a heating rod is provided in the disinfection water production tank, and disinfection is performed by heating at a temperature of 100° C. for 15 minutes.

[0018] It should be understood that each pipeline for conveying water in the present application can be individually provided with a valve.

[0019] In a second aspect, a method for supplying water using a centralized water supply device according to the present invention comprises the following steps:

[0020] Obtain the water to be treated from the water inlet and send it to the primary filter tank for the first filtration to form the first filtered water;

[0021] The water after the first filtration is sent to the ceramic ultrafiltration membrane to form the water after the second filtration;

[0022] The water after the second filtration is sent to a pressure activated carbon filter tank to form water after the third filtration;

[0023] The water after the third filtration is sent to the ceramic nanofiltration membrane to form the water after the fourth filtration;

[0024] The water after the fourth filtration is sent to the disinfection water tank for heating and disinfection, and the disinfected water is output through the water outlet.

[0025] In a preferred embodiment, the method further includes: the heated water in the disinfection water production tank enters the cleaning water tank through overflow for storage; when cleaning is required, the water in the cleaning water tank is pressurized by a third pump and sent into one or more of the primary filtration tank, the ceramic ultrafiltration membrane, the pressure activated carbon filter tank and the ceramic nanofiltration membrane for cleaning and maintenance.

[0026] In a preferred embodiment, the ceramic ultrafiltration membrane and the ceramic nanofiltration membrane are maintained and cleaned every hour, the cleaning pressure is 0.5 MPa, and the cleaning time is 10 seconds.

[0027] In a preferred embodiment, the primary filter tank and the pressure activated carbon filter tank are backflushed every 24 hours.

[0028] In a preferred embodiment, when the water inlet pressure of the ceramic ultrafiltration membrane and / or the ceramic nanofiltration membrane is greater than 2 times the initial pressure, the restorative chemical cleaning is started.

[0029] More preferably, the restorative chemical cleaning agent is: 1000ppm sodium hypochlorite and sodium hydroxide cleaning solution with pH=12, the ceramic ultrafiltration membrane and / or the ceramic nanofiltration membrane is first soaked in the restorative chemical cleaning agent for 2 hours, and then the ceramic ultrafiltration membrane and / or the ceramic nanofiltration membrane is rinsed with clean water at a pressure of 0.5MPa.

[0030] Compared with the prior art, the present invention has the following obvious outstanding substantial features and significant advantages:

[0031] The present invention provides a centralized water supply device and method, which solves the problem of wirelessly realizing stable, safe and efficient centralized water supply under the condition of large water quality differences and poor maintenance conditions. It has the following advantages: (1) The present invention can filter raw water of 1 to 100 NTU, and the produced water can stably meet the standard of GB5749-2022; (2) The operation and maintenance of the present invention basically does not require manual labor, only needs to regularly replenish chemical cleaning agents, can work continuously for more than 1 month, and the water production can be restored to more than 90% of the original after chemical cleaning; (3) The present invention only consumes restorative chemical cleaning agents during the water production process, and uses hot water to disinfect the produced water and flush the equipment, which can effectively inhibit the growth of bacteria and algae in the device and ensure the safety of water supply. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The accompanying drawings, which constitute part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention. In the accompanying drawings:

[0033] Figure 1 It is a flow chart of a centralized water supply device according to a preferred embodiment of the present invention.

[0034] Figure 1 The reference numerals in the figures are described as follows:

[0035] 1. Water inlet; 2. Primary filtration tank; 3. Ceramic ultrafiltration membrane; 4. Pressure activated carbon filter tank; 5. Ceramic nanofiltration membrane; 6. Disinfection water production tank; 7. Water outlet; 8. First pump; 9. Second pump; 10. Coarse screen; 11. Quartz sand filler; 12. Wastewater outlet; 13. Cleaning water tank; 14. Third pump. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0038] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in the field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0040] Embodiment 1:

[0041] In order to solve the problem of wirelessly realizing stable, safe and efficient centralized water supply under the condition of large water quality differences and poor maintenance conditions, this embodiment proposes a centralized water supply device, such as Figure 1 As shown, a centralized water supply device includes a water inlet 1, a primary filter tank 2, a ceramic ultrafiltration membrane 3, a pressure-type activated carbon filter tank 4, a ceramic nanofiltration membrane 5, a disinfection water production tank 6 and a water outlet 7, wherein the water inlet 1, the primary filter tank 2, the ceramic ultrafiltration membrane 3, the pressure-type activated carbon filter tank 4, the ceramic nanofiltration membrane 5, the disinfection water production tank 6 and the water outlet 7 are connected in sequence.

[0042] In this embodiment, a first pump 8 is provided on the pipeline between the primary filter tank 2 and the ceramic ultrafiltration membrane 3, and a second pump 9 (high-pressure pump) is provided on the pipeline between the pressure activated carbon filter tank 4 and the ceramic nanofiltration membrane 5, which improves the filtration efficiency of the incoming water and thus improves the water supply efficiency.

[0043] In this embodiment, a coarse screen 10 and a quartz sand filler 11 are provided inside the primary filter tank 2. The coarse screen 10 intercepts larger particles, thereby reducing the load of subsequent treatment. The bar gap of the coarse screen 10 is 10 to 15 mm, and the diameter specification of the quartz sand filler 11 is 16 to 32 mm.

[0044] In this embodiment, the pore size of the ceramic ultrafiltration membrane 3 is 0.1-1 μm, the operating pressure is <0.1 MPa, and the recovery rate is above 80%.

[0045] In this embodiment, the pressure activated carbon filter tank 4 is filled with 8-10 mesh coconut shell activated carbon, and the maximum pressure of the pressure tank is 2MPa.

[0046] In this embodiment, the molecular weight cut-off of the ceramic nanofiltration membrane 5 is 500 Dalton, the operating pressure is <0.4 MPa, and the recovery rate is above 50%.

[0047] In this embodiment, a heating rod is provided in the disinfection water production tank 6, and disinfection is performed by heating, the heating temperature is 100° C., and the heating time is 15 minutes.

[0048] In this embodiment, a centralized water supply device also includes a wastewater outlet 12, and the primary filter tank 2, the ceramic ultrafiltration membrane 3, the pressure-type activated carbon filter tank 4 and the ceramic nanofiltration membrane 5 are all connected to the wastewater outlet 12 through independent valves, and the wastewater generated by the primary filter tank 2, the ceramic ultrafiltration membrane 3, the pressure-type activated carbon filter tank 4 and the ceramic nanofiltration membrane 5 during the water supply process is discharged through the wastewater outlet 12.

[0049] In this embodiment, the disinfection water production tank 6 is also connected to a cleaning water tank 13. The cleaning water tank 13 is provided with an insulation structure and has a heat preservation function. The water in the disinfection water production tank 6 can enter the cleaning water tank 13 through overflow after being heated; the cleaning water tank 13 is connected to one or more of the primary filtration tank 2, the ceramic ultrafiltration membrane 3, the pressure-type activated carbon filter tank 4, and the ceramic nanofiltration membrane 5; wherein, the cleaning water tank 13 is also provided with a third pump 14 on the upstream pipeline connected to one or more of the primary filtration tank 2, the ceramic ultrafiltration membrane 3, the pressure-type activated carbon filter tank 4, and the ceramic nanofiltration membrane 5.

[0050] It should be understood that each pipeline for conveying water in the present application can be individually provided with a valve.

[0051] In this embodiment, a method for supplying water using a centralized water supply device as described in Embodiment 1 of the present invention includes:

[0052] Step S1, obtaining water to be treated from the water inlet 1, and sending it to the primary filter tank 2 for the first filtration to form first filtered water;

[0053] Step S2, sending the water after the first filtration into the ceramic ultrafiltration membrane 3 to form water after the second filtration;

[0054] Step S3, sending the water after the second filtration into the pressure activated carbon filter tank 4 to form the water after the third filtration;

[0055] Step S4, sending the water after the third filtration into the ceramic nanofiltration membrane 5 to form water after the fourth filtration;

[0056] Step S5, sending the water after the fourth filtration into the disinfection water tank for disinfection, and outputting the disinfected water through the water outlet 7.

[0057] Working principle: When in use, the water first enters the primary filter tank 2, and under the action of gravity, the large-sized debris in the raw water is removed through the coarse grid 10, and then enters the quartz sand filler 11 to remove large-sized particles. After the water flows through the primary filter tank 2 for the first filtration, the water after the first filtration is pressurized by the first pump 8 and enters the ceramic ultrafiltration membrane 3 for the second filtration to remove suspended particles, and then the valve between the ceramic ultrafiltration membrane 3 and the pressure-type activated carbon filter tank 4 is controlled and adjusted by the automatic control system to open. The water flow is sent to the pressure-type activated carbon filter tank 4 for the third filtration, and the water after the third filtration is sent to the ceramic nanofiltration membrane 5 for the fourth filtration through the second pump 9 (which can be a high-pressure pump). After completing the four water filtrations, the water is sent to the disinfection water production tank 6 for disinfection, and the clean drinking water obtained after disinfection is sent to the outlet 7 to complete the drinking water supply.

[0058] Embodiment 2:

[0059] In this embodiment, a centralized water supply device as described in Embodiment 1 of the present invention is used. The water supply method of the centralized water supply device also includes a cleaning step, specifically including sending water in the cleaning water tank 13 into one or more of the primary filter tank 2, the ceramic ultrafiltration membrane 3, the pressure activated carbon filter tank 4 and the ceramic nanofiltration membrane 5 through the third pump 14 for cleaning and maintenance, which may specifically include the following steps:

[0060] The cleaning water tank 13 receives water from the disinfection water production tank 6 through overflow, and the valve is closed when the cleaning water tank 13 is full.

[0061] The ceramic ultrafiltration membrane 3 and the ceramic nanofiltration membrane 5 are maintained and cleaned every hour. During cleaning, the third pump 14 is turned on to pressurize the water in the cleaning water tank 13 and send it into the ceramic ultrafiltration membrane 3 or the ceramic nanofiltration membrane 5 to clean the ceramic ultrafiltration membrane 3 or the ceramic nanofiltration membrane 5. The cleaning pressure is 0.5 MPa and the cleaning time is 10 seconds.

[0062] The primary filter 2 and the pressure activated carbon filter tank 4 are backwashed every 24 hours. During backwashing, the third pump 14 is turned on to pressurize the water in the cleaning water tank 13 and send it into the primary filter 2 and the pressure activated carbon filter tank 4 to clean the primary filter 2 and the pressure activated carbon filter tank 4. The cleaning pressure is 0.1MPa, the cleaning soaking time is 5 minutes, the backwashing time is 10 minutes, and the flushing intensity is 15-18L / (m 2 ·s).

[0063] Among them, when the water inlet pressure of the ceramic ultrafiltration membrane 3 or the ceramic nanofiltration membrane 5 is greater than 2 times the initial pressure, the restorative chemical cleaning is started. The restorative chemical cleaning agent is: 1000ppm sodium hypochlorite and sodium hydroxide cleaning solution with pH=12. The soaking time is 2 hours. The restorative chemical cleaning agent can be manually prepared in the cleaning water tank 13 in advance. The ceramic ultrafiltration membrane and / or the ceramic nanofiltration membrane are first soaked in the restorative chemical cleaning agent. After the soaking is completed, the membrane surface of the ceramic ultrafiltration membrane and / or the ceramic nanofiltration membrane is rinsed with 0.5MPa clean water to wash away the residual agent on the membrane surface.

[0064] The specific embodiments of the present invention are described in detail above, but they are only examples, and the present invention is not limited to the specific embodiments described above. For those skilled in the art, any equivalent modifications and substitutions made to the present invention are also within the scope of the present invention. Therefore, the equalization changes and modifications made without departing from the spirit and scope of the present invention should be included in the scope of the present invention.

Claims

1. A centralized water supply device, characterized in that: include: The water inlet, primary filter tank, ceramic ultrafiltration membrane, pressure activated carbon filter tank, ceramic nanofiltration membrane, disinfection water production tank and water outlet are connected in sequence, as well as a cleaning water tank connected to the disinfection water production tank; wherein, The primary filter tank is provided with a coarse grid and quartz sand filler; The disinfection water production tank is provided with a heating device for heating water to the disinfection temperature; The cleaning water tank is provided with a heat preservation structure for maintaining the water temperature in the tank within a preset range; the heated water in the disinfection water production tank enters the cleaning water tank through overflow; The cleaning water tank is also connected to one or more of the primary filter tank, the ceramic ultrafiltration membrane, the pressure activated carbon filter tank, and the ceramic nanofiltration membrane through a pipeline, and the hot water in the cleaning water tank is used to clean the filter components regularly or as needed; The primary filtration tank, the ceramic ultrafiltration membrane, the pressure activated carbon filter tank and the ceramic nanofiltration membrane are each connected to the wastewater outlet through an independent valve.

2. A centralized water supply device according to claim 1, characterized in that: A first pump is provided on the pipeline between the primary filtration tank and the ceramic ultrafiltration membrane, and a second pump is provided on the pipeline between the pressure activated carbon filter tank and the ceramic nanofiltration membrane.

3. A centralized water supply device according to claim 1 or 2, characterized in that: A third pump is also provided on the pipeline connecting the cleaning water tank to one or more upstream of the primary filtration tank, the ceramic ultrafiltration membrane, the pressure activated carbon filter tank, and the ceramic nanofiltration membrane.

4. A centralized water supply device according to claim 1, characterized in that: The bar gap of the coarse grid is 10-15 mm, and the diameter of the quartz sand filler is 16-32 mm.

5. A centralized water supply device according to claim 1, characterized in that: The pore size of the ceramic ultrafiltration membrane is 0.1-1 μm, the operating pressure is less than 0.1 MPa, and the recovery rate is above 80%.

6. A centralized water supply device according to claim 1, characterized in that: The pressure activated carbon filter tank is filled with 8-10 mesh coconut shell activated carbon, and the maximum pressure bearing capacity of the pressure tank is 2Mpa.

7. A centralized water supply device according to claim 1, characterized in that: The molecular weight cut-off of the ceramic nanofiltration membrane is 500 Dalton, the operating pressure is less than 0.4 MPa, and the recovery rate is above 50%.

8. A centralized water supply device according to claim 1, characterized in that: A heating rod is arranged in the disinfection water production tank, and disinfection is performed by heating, the heating temperature is 100° C., and the heating time is 15 minutes.

9. A method for supplying water using the centralized water supply device according to claim 1, characterized in that: The steps include: Obtain the water to be treated from the water inlet and send it to the primary filter tank for the first filtration to form the first filtered water; The water after the first filtration is sent to the ceramic ultrafiltration membrane to form the water after the second filtration; The water after the second filtration is sent to a pressure activated carbon filter tank to form water after the third filtration; The water after the third filtration is sent to the ceramic nanofiltration membrane to form the water after the fourth filtration; The water after the fourth filtration is sent to the disinfection water tank for heating and disinfection, and the disinfected water is output through the water outlet; The method also includes: the heated water in the disinfection water production tank flows into the cleaning water tank through overflow for storage; when cleaning is required, the water in the cleaning water tank is pressurized by a third pump and sent into one or more of the primary filtration tank, the ceramic ultrafiltration membrane, the pressure activated carbon filter tank and the ceramic nanofiltration membrane for cleaning and maintenance.

10. The method according to claim 9, characterized in that The ceramic ultrafiltration membrane and the ceramic nanofiltration membrane are maintained and cleaned every hour, the cleaning pressure is 0.5MPa, and the cleaning time is 10s; the primary filter tank and the pressure activated carbon filter tank are backwashed every 24 hours; when the water inlet pressure of the ceramic ultrafiltration membrane and / or the ceramic nanofiltration membrane is greater than 2 times the initial pressure, the restorative chemical cleaning is started; wherein the restorative chemical cleaning agent is 1000ppm sodium hypochlorite and a sodium hydroxide cleaning solution with a pH of 12, the ceramic ultrafiltration membrane and / or the ceramic nanofiltration membrane are first soaked in the restorative chemical cleaning agent for 2 hours, and then the ceramic ultrafiltration membrane and / or the ceramic nanofiltration membrane are rinsed with clean water at a pressure of 0.5Mpa.

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